#region Header
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/**
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* JsonMapper.cs
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* JSON to .Net object and object to JSON conversions.
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*
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* The authors disclaim copyright to this source code. For more details, see
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* the COPYING file included with this distribution.
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**/
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#endregion
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Globalization;
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using System.IO;
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using System.Reflection;
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namespace LitJson {
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internal struct PropertyMetadata {
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public MemberInfo Info;
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public bool IsField;
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public Type Type;
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}
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internal struct ArrayMetadata {
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private Type element_type;
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private bool is_array;
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private bool is_list;
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public Type ElementType {
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get {
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if (element_type == null)
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return typeof(JsonData);
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return element_type;
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}
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set { element_type = value; }
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}
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public bool IsArray {
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get { return is_array; }
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set { is_array = value; }
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}
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public bool IsList {
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get { return is_list; }
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set { is_list = value; }
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}
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}
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internal struct ObjectMetadata {
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private Type element_type;
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private bool is_dictionary;
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private IDictionary<string, PropertyMetadata> properties;
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public Type ElementType {
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get {
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if (element_type == null)
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return typeof(JsonData);
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return element_type;
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}
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set { element_type = value; }
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}
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public bool IsDictionary {
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get { return is_dictionary; }
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set { is_dictionary = value; }
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}
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public IDictionary<string, PropertyMetadata> Properties {
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get { return properties; }
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set { properties = value; }
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}
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}
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internal delegate void ExporterFunc (object obj, JsonWriter writer);
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public delegate void ExporterFunc<T> (T obj, JsonWriter writer);
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internal delegate object ImporterFunc (object input);
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public delegate TValue ImporterFunc<TJson, TValue> (TJson input);
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public delegate IJsonWrapper WrapperFactory ();
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public class JsonMapper {
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#region Fields
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private static int max_nesting_depth;
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private static IFormatProvider datetime_format;
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private static IDictionary<Type, ExporterFunc> base_exporters_table;
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private static IDictionary<Type, ExporterFunc> custom_exporters_table;
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private static IDictionary<Type,
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IDictionary<Type, ImporterFunc>> base_importers_table;
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private static IDictionary<Type,
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IDictionary<Type, ImporterFunc>> custom_importers_table;
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private static IDictionary<Type, ArrayMetadata> array_metadata;
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private static readonly object array_metadata_lock = new Object();
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private static IDictionary<Type,
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IDictionary<Type, MethodInfo>> conv_ops;
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private static readonly object conv_ops_lock = new Object();
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private static IDictionary<Type, ObjectMetadata> object_metadata;
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private static readonly object object_metadata_lock = new Object();
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private static IDictionary<Type,
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IList<PropertyMetadata>> type_properties;
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private static readonly object type_properties_lock = new Object();
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private static JsonWriter static_writer;
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private static readonly object static_writer_lock = new Object();
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#endregion
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#region Constructors
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static JsonMapper () {
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max_nesting_depth = 100;
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array_metadata = new Dictionary<Type, ArrayMetadata>();
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conv_ops = new Dictionary<Type, IDictionary<Type, MethodInfo>>();
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object_metadata = new Dictionary<Type, ObjectMetadata>();
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type_properties = new Dictionary<Type,
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IList<PropertyMetadata>>();
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static_writer = new JsonWriter();
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datetime_format = DateTimeFormatInfo.InvariantInfo;
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base_exporters_table = new Dictionary<Type, ExporterFunc>();
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custom_exporters_table = new Dictionary<Type, ExporterFunc>();
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base_importers_table = new Dictionary<Type,
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IDictionary<Type, ImporterFunc>>();
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custom_importers_table = new Dictionary<Type,
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IDictionary<Type, ImporterFunc>>();
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RegisterBaseExporters();
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RegisterBaseImporters();
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}
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#endregion
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#region Private Methods
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private static void AddArrayMetadata (Type type) {
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if (array_metadata.ContainsKey(type))
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return;
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ArrayMetadata data = new ArrayMetadata();
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data.IsArray = type.IsArray;
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if (type.GetInterface("System.Collections.IList") != null)
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data.IsList = true;
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foreach (PropertyInfo p_info in type.GetProperties()) {
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if (p_info.Name != "Item")
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continue;
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ParameterInfo[] parameters = p_info.GetIndexParameters();
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if (parameters.Length != 1)
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continue;
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if (parameters[0].ParameterType == typeof(int))
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data.ElementType = p_info.PropertyType;
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}
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lock (array_metadata_lock) {
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try {
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array_metadata.Add(type, data);
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}
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catch (ArgumentException) {
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return;
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}
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}
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}
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private static void AddObjectMetadata (Type type) {
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if (object_metadata.ContainsKey(type))
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return;
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ObjectMetadata data = new ObjectMetadata();
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if (type.GetInterface("System.Collections.IDictionary") != null)
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data.IsDictionary = true;
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data.Properties = new Dictionary<string, PropertyMetadata>();
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foreach (PropertyInfo p_info in type.GetProperties()) {
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if (p_info.Name == "Item") {
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ParameterInfo[] parameters = p_info.GetIndexParameters();
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if (parameters.Length != 1)
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continue;
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if (parameters[0].ParameterType == typeof(string))
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data.ElementType = p_info.PropertyType;
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continue;
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}
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PropertyMetadata p_data = new PropertyMetadata();
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p_data.Info = p_info;
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p_data.Type = p_info.PropertyType;
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data.Properties.Add(p_info.Name, p_data);
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}
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foreach (FieldInfo f_info in type.GetFields(BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public)) {
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if (f_info.IsNotSerialized)
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continue;
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PropertyMetadata p_data = new PropertyMetadata();
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p_data.Info = f_info;
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p_data.IsField = true;
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p_data.Type = f_info.FieldType;
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data.Properties.Add(f_info.Name, p_data);
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}
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lock (object_metadata_lock) {
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try {
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object_metadata.Add(type, data);
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}
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catch (ArgumentException) {
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return;
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}
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}
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}
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private static void AddTypeProperties (Type type) {
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if (type_properties.ContainsKey(type))
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return;
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IList<PropertyMetadata> props = new List<PropertyMetadata>();
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foreach (PropertyInfo p_info in type.GetProperties()) {
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if (p_info.Name == "Item")
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continue;
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PropertyMetadata p_data = new PropertyMetadata();
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p_data.Info = p_info;
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p_data.IsField = false;
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props.Add(p_data);
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}
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foreach (FieldInfo f_info in type.GetFields(BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public)) {
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if (f_info.IsNotSerialized)
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continue;
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PropertyMetadata p_data = new PropertyMetadata();
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p_data.Info = f_info;
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p_data.IsField = true;
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props.Add(p_data);
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}
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lock (type_properties_lock) {
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try {
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type_properties.Add(type, props);
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}
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catch (ArgumentException) {
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return;
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}
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}
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}
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private static MethodInfo GetConvOp (Type t1, Type t2) {
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lock (conv_ops_lock) {
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if (!conv_ops.ContainsKey(t1))
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conv_ops.Add(t1, new Dictionary<Type, MethodInfo>());
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}
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if (conv_ops[t1].ContainsKey(t2))
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return conv_ops[t1][t2];
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MethodInfo op = t1.GetMethod(
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"op_Implicit", new Type[] { t2 });
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lock (conv_ops_lock) {
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try {
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conv_ops[t1].Add(t2, op);
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}
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catch (ArgumentException) {
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return conv_ops[t1][t2];
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}
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}
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return op;
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}
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private static object ReadValue (Type inst_type, JsonReader reader) {
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reader.Read();
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if (reader.Token == JsonToken.ArrayEnd)
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return null;
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Type underlying_type = Nullable.GetUnderlyingType(inst_type);
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Type value_type = underlying_type ?? inst_type;
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if (reader.Token == JsonToken.Null) {
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if (inst_type.IsClass || underlying_type != null) {
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return null;
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}
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throw new JsonException(String.Format(
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"Can't assign null to an instance of type {0}",
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inst_type));
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}
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if (reader.Token == JsonToken.Double ||
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reader.Token == JsonToken.Int ||
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reader.Token == JsonToken.Long ||
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reader.Token == JsonToken.String ||
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reader.Token == JsonToken.Boolean) {
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Type json_type = reader.Value.GetType();
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if (value_type.IsAssignableFrom(json_type))
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return reader.Value;
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// If there's a custom importer that fits, use it
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if (custom_importers_table.ContainsKey(json_type) &&
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custom_importers_table[json_type].ContainsKey(
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value_type)) {
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ImporterFunc importer =
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custom_importers_table[json_type][value_type];
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return importer(reader.Value);
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}
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// Maybe there's a base importer that works
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if (base_importers_table.ContainsKey(json_type) &&
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base_importers_table[json_type].ContainsKey(
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value_type)) {
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ImporterFunc importer =
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base_importers_table[json_type][value_type];
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return importer(reader.Value);
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}
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// Maybe it's an enum
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if (value_type.IsEnum)
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return Enum.ToObject(value_type, reader.Value);
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// Try using an implicit conversion operator
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MethodInfo conv_op = GetConvOp(value_type, json_type);
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if (conv_op != null)
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return conv_op.Invoke(null,
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new object[] { reader.Value });
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// No luck
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throw new JsonException(String.Format(
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"Can't assign value '{0}' (type {1}) to type {2}",
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reader.Value, json_type, inst_type));
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}
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object instance = null;
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if (reader.Token == JsonToken.ArrayStart) {
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AddArrayMetadata(inst_type);
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ArrayMetadata t_data = array_metadata[inst_type];
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if (!t_data.IsArray && !t_data.IsList)
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throw new JsonException(String.Format(
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"Type {0} can't act as an array",
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inst_type));
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IList list;
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Type elem_type;
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if (!t_data.IsArray) {
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list = (IList)Activator.CreateInstance(inst_type);
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elem_type = t_data.ElementType;
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}
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else {
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list = new ArrayList();
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elem_type = inst_type.GetElementType();
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}
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while (true) {
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object item = ReadValue(elem_type, reader);
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if (item == null && reader.Token == JsonToken.ArrayEnd)
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break;
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list.Add(item);
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}
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if (t_data.IsArray) {
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int n = list.Count;
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instance = Array.CreateInstance(elem_type, n);
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for (int i = 0; i < n; i++)
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((Array)instance).SetValue(list[i], i);
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}
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else
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instance = list;
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}
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else if (reader.Token == JsonToken.ObjectStart) {
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AddObjectMetadata(value_type);
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ObjectMetadata t_data = object_metadata[value_type];
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instance = Activator.CreateInstance(value_type);
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while (true) {
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reader.Read();
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if (reader.Token == JsonToken.ObjectEnd)
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break;
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string property = (string)reader.Value;
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if (t_data.Properties.ContainsKey(property)) {
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PropertyMetadata prop_data =
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t_data.Properties[property];
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if (prop_data.IsField) {
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((FieldInfo)prop_data.Info).SetValue(
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instance, ReadValue(prop_data.Type, reader));
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}
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else {
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PropertyInfo p_info =
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(PropertyInfo)prop_data.Info;
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if (p_info.CanWrite)
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p_info.SetValue(
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instance,
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ReadValue(prop_data.Type, reader),
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null);
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else
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ReadValue(prop_data.Type, reader);
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}
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}
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else {
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if (!t_data.IsDictionary) {
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if (!reader.SkipNonMembers) {
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throw new JsonException(String.Format(
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"The type {0} doesn't have the " +
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"property '{1}'",
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inst_type, property));
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}
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else {
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ReadSkip(reader);
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continue;
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}
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}
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((IDictionary)instance).Add(
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property, ReadValue(
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t_data.ElementType, reader));
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}
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}
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}
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return instance;
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}
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private static IJsonWrapper ReadValue (WrapperFactory factory,
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JsonReader reader) {
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reader.Read();
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if (reader.Token == JsonToken.ArrayEnd ||
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reader.Token == JsonToken.Null)
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return null;
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IJsonWrapper instance = factory();
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if (reader.Token == JsonToken.String) {
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instance.SetString((string)reader.Value);
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return instance;
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}
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if (reader.Token == JsonToken.Double) {
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instance.SetDouble((double)reader.Value);
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return instance;
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}
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if (reader.Token == JsonToken.Int) {
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instance.SetInt((int)reader.Value);
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return instance;
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}
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if (reader.Token == JsonToken.Long) {
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instance.SetLong((long)reader.Value);
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return instance;
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}
|
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if (reader.Token == JsonToken.Boolean) {
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instance.SetBoolean((bool)reader.Value);
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return instance;
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}
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if (reader.Token == JsonToken.ArrayStart) {
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instance.SetJsonType(JsonType.Array);
|
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while (true) {
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IJsonWrapper item = ReadValue(factory, reader);
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if (item == null && reader.Token == JsonToken.ArrayEnd)
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break;
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((IList)instance).Add(item);
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}
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}
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else if (reader.Token == JsonToken.ObjectStart) {
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instance.SetJsonType(JsonType.Object);
|
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while (true) {
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reader.Read();
|
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if (reader.Token == JsonToken.ObjectEnd)
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break;
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string property = (string)reader.Value;
|
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((IDictionary)instance)[property] = ReadValue(
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factory, reader);
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}
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}
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return instance;
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}
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private static void ReadSkip (JsonReader reader) {
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ToWrapper(
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delegate { return new JsonMockWrapper(); }, reader);
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}
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private static void RegisterBaseExporters () {
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base_exporters_table[typeof(byte)] =
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delegate (object obj, JsonWriter writer) {
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writer.Write(Convert.ToInt32((byte)obj));
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};
|
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base_exporters_table[typeof(char)] =
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delegate (object obj, JsonWriter writer) {
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writer.Write(Convert.ToString((char)obj));
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};
|
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base_exporters_table[typeof(DateTime)] =
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delegate (object obj, JsonWriter writer) {
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writer.Write(Convert.ToString((DateTime)obj,
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datetime_format));
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};
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base_exporters_table[typeof(decimal)] =
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delegate (object obj, JsonWriter writer) {
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writer.Write((decimal)obj);
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};
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base_exporters_table[typeof(sbyte)] =
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delegate (object obj, JsonWriter writer) {
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writer.Write(Convert.ToInt32((sbyte)obj));
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};
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base_exporters_table[typeof(short)] =
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delegate (object obj, JsonWriter writer) {
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writer.Write(Convert.ToInt32((short)obj));
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};
|
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base_exporters_table[typeof(ushort)] =
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delegate (object obj, JsonWriter writer) {
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writer.Write(Convert.ToInt32((ushort)obj));
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};
|
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base_exporters_table[typeof(uint)] =
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delegate (object obj, JsonWriter writer) {
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writer.Write(Convert.ToUInt64((uint)obj));
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};
|
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base_exporters_table[typeof(ulong)] =
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delegate (object obj, JsonWriter writer) {
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writer.Write((ulong)obj);
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};
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}
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private static void RegisterBaseImporters () {
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ImporterFunc importer;
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importer = delegate (object input) {
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return Convert.ToByte((int)input);
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};
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RegisterImporter(base_importers_table, typeof(int),
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typeof(byte), importer);
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importer = delegate (object input) {
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return Convert.ToUInt64((int)input);
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};
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RegisterImporter(base_importers_table, typeof(int),
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typeof(ulong), importer);
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importer = delegate (object input) {
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return Convert.ToSByte((int)input);
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};
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RegisterImporter(base_importers_table, typeof(int),
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typeof(sbyte), importer);
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importer = delegate (object input) {
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return Convert.ToInt16((int)input);
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};
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RegisterImporter(base_importers_table, typeof(int),
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typeof(short), importer);
|
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importer = delegate (object input) {
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return Convert.ToUInt16((int)input);
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};
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RegisterImporter(base_importers_table, typeof(int),
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typeof(ushort), importer);
|
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importer = delegate (object input) {
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return Convert.ToUInt32((int)input);
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};
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RegisterImporter(base_importers_table, typeof(int),
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typeof(uint), importer);
|
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importer = delegate (object input) {
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return Convert.ToSingle((int)input);
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};
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RegisterImporter(base_importers_table, typeof(int),
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typeof(float), importer);
|
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importer = delegate (object input) {
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return Convert.ToDouble((int)input);
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};
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RegisterImporter(base_importers_table, typeof(int),
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typeof(double), importer);
|
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importer = delegate (object input) {
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return Convert.ToDecimal((double)input);
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};
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RegisterImporter(base_importers_table, typeof(double),
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typeof(decimal), importer);
|
|
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importer = delegate (object input) {
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return Convert.ToUInt32((long)input);
|
};
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RegisterImporter(base_importers_table, typeof(long),
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typeof(uint), importer);
|
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importer = delegate (object input) {
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return Convert.ToChar((string)input);
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};
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RegisterImporter(base_importers_table, typeof(string),
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typeof(char), importer);
|
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importer = delegate (object input) {
|
return Convert.ToDateTime((string)input, datetime_format);
|
};
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RegisterImporter(base_importers_table, typeof(string),
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typeof(DateTime), importer);
|
}
|
|
private static void RegisterImporter (
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IDictionary<Type, IDictionary<Type, ImporterFunc>> table,
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Type json_type, Type value_type, ImporterFunc importer) {
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if (!table.ContainsKey(json_type))
|
table.Add(json_type, new Dictionary<Type, ImporterFunc>());
|
|
table[json_type][value_type] = importer;
|
}
|
|
private static void WriteValue (object obj, JsonWriter writer,
|
bool writer_is_private,
|
int depth) {
|
if (depth > max_nesting_depth)
|
throw new JsonException(String.Format(
|
"Max allowed object depth reached while " +
|
"trying to export from type {0}",
|
obj.GetType()));
|
|
if (obj == null) {
|
writer.Write(null);
|
return;
|
}
|
|
if (obj is IJsonWrapper) {
|
if (writer_is_private)
|
writer.TextWriter.Write(((IJsonWrapper)obj).ToJson());
|
else
|
((IJsonWrapper)obj).ToJson(writer);
|
|
return;
|
}
|
|
if (obj is String) {
|
writer.Write((string)obj);
|
return;
|
}
|
|
if (obj is Double) {
|
writer.Write((double)obj);
|
return;
|
}
|
|
if (obj is Int32) {
|
writer.Write((int)obj);
|
return;
|
}
|
|
if (obj is Boolean) {
|
writer.Write((bool)obj);
|
return;
|
}
|
|
if (obj is Int64) {
|
writer.Write((long)obj);
|
return;
|
}
|
|
if (obj is Array) {
|
writer.WriteArrayStart();
|
|
foreach (object elem in (Array)obj)
|
WriteValue(elem, writer, writer_is_private, depth + 1);
|
|
writer.WriteArrayEnd();
|
|
return;
|
}
|
|
if (obj is IList) {
|
writer.WriteArrayStart();
|
foreach (object elem in (IList)obj)
|
WriteValue(elem, writer, writer_is_private, depth + 1);
|
writer.WriteArrayEnd();
|
|
return;
|
}
|
|
if (obj is IDictionary) {
|
writer.WriteObjectStart();
|
foreach (DictionaryEntry entry in (IDictionary)obj) {
|
writer.WritePropertyName((string)entry.Key);
|
WriteValue(entry.Value, writer, writer_is_private,
|
depth + 1);
|
}
|
writer.WriteObjectEnd();
|
|
return;
|
}
|
|
Type obj_type = obj.GetType();
|
|
// See if there's a custom exporter for the object
|
if (custom_exporters_table.ContainsKey(obj_type)) {
|
ExporterFunc exporter = custom_exporters_table[obj_type];
|
exporter(obj, writer);
|
|
return;
|
}
|
|
// If not, maybe there's a base exporter
|
if (base_exporters_table.ContainsKey(obj_type)) {
|
ExporterFunc exporter = base_exporters_table[obj_type];
|
exporter(obj, writer);
|
|
return;
|
}
|
|
// Last option, let's see if it's an enum
|
if (obj is Enum) {
|
Type e_type = Enum.GetUnderlyingType(obj_type);
|
|
if (e_type == typeof(long)
|
|| e_type == typeof(uint)
|
|| e_type == typeof(ulong))
|
writer.Write((ulong)obj);
|
else
|
writer.Write((int)obj);
|
|
return;
|
}
|
|
// Okay, so it looks like the input should be exported as an
|
// object
|
AddTypeProperties(obj_type);
|
IList<PropertyMetadata> props = type_properties[obj_type];
|
|
writer.WriteObjectStart();
|
foreach (PropertyMetadata p_data in props) {
|
if (p_data.IsField) {
|
writer.WritePropertyName(p_data.Info.Name);
|
WriteValue(((FieldInfo)p_data.Info).GetValue(obj),
|
writer, writer_is_private, depth + 1);
|
}
|
else {
|
PropertyInfo p_info = (PropertyInfo)p_data.Info;
|
|
if (p_info.CanRead) {
|
writer.WritePropertyName(p_data.Info.Name);
|
WriteValue(p_info.GetValue(obj, null),
|
writer, writer_is_private, depth + 1);
|
}
|
}
|
}
|
writer.WriteObjectEnd();
|
}
|
#endregion
|
|
|
public static string ToJson (object obj) {
|
lock (static_writer_lock) {
|
static_writer.Reset();
|
|
WriteValue(obj, static_writer, true, 0);
|
|
return static_writer.ToString();
|
}
|
}
|
|
public static void ToJson (object obj, JsonWriter writer) {
|
WriteValue(obj, writer, false, 0);
|
}
|
|
public static JsonData ToObject (JsonReader reader) {
|
return (JsonData)ToWrapper(
|
delegate { return new JsonData(); }, reader);
|
}
|
|
public static JsonData ToObject (TextReader reader) {
|
JsonReader json_reader = new JsonReader(reader);
|
|
return (JsonData)ToWrapper(
|
delegate { return new JsonData(); }, json_reader);
|
}
|
|
public static JsonData ToObject (string json) {
|
return (JsonData)ToWrapper(
|
delegate { return new JsonData(); }, json);
|
}
|
|
public static T ToObject<T> (JsonReader reader) {
|
return (T)ReadValue(typeof(T), reader);
|
}
|
|
public static T ToObject<T> (TextReader reader) {
|
JsonReader json_reader = new JsonReader(reader);
|
|
return (T)ReadValue(typeof(T), json_reader);
|
}
|
|
public static T ToObject<T> (string json) {
|
JsonReader reader = new JsonReader(json);
|
|
return (T)ReadValue(typeof(T), reader);
|
}
|
|
public static IJsonWrapper ToWrapper (WrapperFactory factory,
|
JsonReader reader) {
|
return ReadValue(factory, reader);
|
}
|
|
public static IJsonWrapper ToWrapper (WrapperFactory factory,
|
string json) {
|
JsonReader reader = new JsonReader(json);
|
|
return ReadValue(factory, reader);
|
}
|
|
public static void RegisterExporter<T> (ExporterFunc<T> exporter) {
|
ExporterFunc exporter_wrapper =
|
delegate (object obj, JsonWriter writer) {
|
exporter((T)obj, writer);
|
};
|
|
custom_exporters_table[typeof(T)] = exporter_wrapper;
|
}
|
|
public static void RegisterImporter<TJson, TValue> (
|
ImporterFunc<TJson, TValue> importer) {
|
ImporterFunc importer_wrapper =
|
delegate (object input) {
|
return importer((TJson)input);
|
};
|
|
RegisterImporter(custom_importers_table, typeof(TJson),
|
typeof(TValue), importer_wrapper);
|
}
|
|
public static void UnregisterExporters () {
|
custom_exporters_table.Clear();
|
}
|
|
public static void UnregisterImporters () {
|
custom_importers_table.Clear();
|
}
|
}
|
}
|
